Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 344 · 40 questions

The fast method (Casting out nines): Find the nine-check number of each number: add the digits until one digit is left. Do the same sum (× or +) with those digits and shrink the result to one digit too. Shrink the given answer. Different → wrong. Same → it passes the check.

1. 1.Check with nines: 286 + 845 = 1131. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 65 × 85 = 5530. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 86 × 90 = 7740. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 96 × 93 = 8928. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 19 × 98 = 1864. Correct or wrong? (a) correct (b) wrong
6. 6.Check with nines: 65 × 62 = 4030. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 18 × 57 = 1026. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 835 + 613 = 1453. Correct or wrong? (a) correct (b) wrong
9. 9.Check with nines: 154 + 243 = 395. Correct or wrong? (a) wrong (b) correct
10. 10.Check with nines: 356 + 787 = 1143. Correct or wrong? (a) correct (b) wrong
11. 11.Check with nines: 315 + 137 = 457. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 56 × 85 = 4757. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 48 × 55 = 2640. Correct or wrong? (a) wrong (b) correct
14. 14.Check with nines: 46 × 45 = 2070. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 197 + 642 = 839. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 189 + 788 = 977. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 26 × 59 = 1534. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 98 × 31 = 3038. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 62 × 21 = 1302. Correct or wrong? (a) correct (b) wrong
20. 20.Check with nines: 763 + 225 = 981. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 141 + 993 = 1135. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 24 × 36 = 864. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 74 × 13 = 964. Correct or wrong? (a) correct (b) wrong
24. 24.Check with nines: 459 + 331 = 787. Correct or wrong? (a) wrong (b) correct
25. 25.Check with nines: 27 × 50 = 1350. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 888 + 312 = 1200. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 44 × 92 = 4048. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 516 + 444 = 960. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 73 × 62 = 4528. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 398 + 567 = 965. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 201 + 468 = 669. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 926 + 911 = 1837. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 190 + 593 = 777. Correct or wrong? (a) wrong (b) correct
34. 34.Check with nines: 250 + 616 = 866. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 49 × 25 = 1224. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 26 × 37 = 962. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 256 + 379 = 642. Correct or wrong? (a) wrong (b) correct
38. 38.Check with nines: 15 × 71 = 1065. Correct or wrong? (a) wrong (b) correct
39. 39.Check with nines: 82 × 76 = 6231. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 68 × 14 = 952. Correct or wrong? (a) correct (b) wrong

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